Changes

Warfare has been a constant throughout human history and conflict can certainly be traced back to our hominid ancestors in our evolutionary past. While technology today is often used as the distinguishing characteristic of warfare, the development of the professional army, that is fulltime soldiers and formations of a standing army, was also an important factor in making warfare an affair conducted throughout the year and allowed the establishment of large-scale states and empires to be possible.<ref>For general information about the history of war and armies, see: Chaliand, Gérard, ed. 1994. ''The Art of War in World History: From Antiquity to the Nuclear Age''. Berkeley: University of California Press.</ref> This also paved the way for early states and empires to compete more with each other, helping to develop a variety of other social and technical innovations, including shaping our own world.

In early warfare, from what we can tell when textual sources first become available to us at around the 3rd millennium BC, men would be conscripted for specific campaigns or years when kings were fighting neighboring kingdoms, where the conscripted soldiers would not be required to serve for very long periods and would simply return to their previous employment/professions after the campaign would finish.<ref>For information about early conscription in warfare in city-states, see: Trigger, Bruce G. 2007. ''Understanding Early Civilizations: A Comparative Study''. 1. paperback ed. Cambridge: Cambridge Univ. Press.</ref> By the mid 3rd millennium BC, there were attempts to create standing armies of professional soldiers.<ref>For information on early professional armies in Mesopotamia, see Bauer, S. Wise. 2007. ''The History of the Ancient World: From the Earliest Accounts to the Fall of Rome''. 1st ed. New York: W.W. Norton, pg. 167.</ref>